From c32b82afaf261ebb922269e2be298e05331b875c Mon Sep 17 00:00:00 2001 From: Pavel Dovgalyuk Date: Mon, 14 Mar 2016 10:44:53 +0300 Subject: block: add flush callback This patch adds callback for flush request. This callback is responsible for flushing whole block devices stack. bdrv_flush function does not proceed to underlying devices. It should be performed by this callback function, if needed. Signed-off-by: Pavel Dovgalyuk Signed-off-by: Kevin Wolf --- block/io.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'block/io.c') diff --git a/block/io.c b/block/io.c index 4520cab852..c8f5401076 100644 --- a/block/io.c +++ b/block/io.c @@ -2333,6 +2333,13 @@ int coroutine_fn bdrv_co_flush(BlockDriverState *bs) } tracked_request_begin(&req, bs, 0, 0, BDRV_TRACKED_FLUSH); + + /* Write back all layers by calling one driver function */ + if (bs->drv->bdrv_co_flush) { + ret = bs->drv->bdrv_co_flush(bs); + goto out; + } + /* Write back cached data to the OS even with cache=unsafe */ BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_OS); if (bs->drv->bdrv_co_flush_to_os) { -- cgit v1.2.3